PHP Notes

I am trying to teach myself PHP and this post is just of my notes for PHP. I know a lot of this information is already out there on the web, but it helps me remember and learn when I write things down.

So, needless to say, this post will continue to grow over time.

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Beginning and Ending Blocks

Standard Tag	<?php	?>
Short Tag	<?	?>
Script Tag	<script language="php">	</script>

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Variables

Variables in PHP begin with a dollar ($) sign and either a letter or an _ (underscore).

Example:
$test
$_1234

Variables do not need to be declared as a type, the PHP engine decides the variable type based on type of data the variable holds.

Types of Variable:

Integer	Whole number
Double	Floating point number (Decimal Point)
String	Collection of characters
Boolean	True or false

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Difference Between =, = =, and = = =

• = : Sets the value of a variable
• = = : Comparative operator; Means equivalent (Are variables X and Y apples?)
• = = = : Comparative operator; Means exactly the same (Are these apples exactly the same? Both have that green and dark red spot?)

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